1 /**
2 * collectd - src/exec.c
3 * Copyright (C) 2007-2010 Florian octo Forster
4 * Copyright (C) 2007-2009 Sebastian Harl
5 * Copyright (C) 2008 Peter Holik
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; only version 2 of the License is applicable.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Authors:
21 * Florian octo Forster <octo at verplant.org>
22 * Sebastian Harl <sh at tokkee.org>
23 * Peter Holik <peter at holik.at>
24 **/
26 #define _BSD_SOURCE /* For setgroups */
28 #include "collectd.h"
29 #include "common.h"
30 #include "plugin.h"
32 #include "utils_cmd_putval.h"
33 #include "utils_cmd_putnotif.h"
35 #include <sys/types.h>
36 #include <pwd.h>
37 #include <grp.h>
38 #include <signal.h>
40 #include <pthread.h>
42 #define PL_NORMAL 0x01
43 #define PL_NOTIF_ACTION 0x02
45 #define PL_RUNNING 0x10
47 /*
48 * Private data types
49 */
50 /*
51 * Access to this structure is serialized using the `pl_lock' lock and the
52 * `PL_RUNNING' flag. The execution of notifications is *not* serialized, so
53 * all functions used to handle notifications MUST NOT write to this structure.
54 * The `pid' and `status' fields are thus unused if the `PL_NOTIF_ACTION' flag
55 * is set.
56 * The `PL_RUNNING' flag is set in `exec_read' and unset in `exec_read_one'.
57 */
58 struct program_list_s;
59 typedef struct program_list_s program_list_t;
60 struct program_list_s
61 {
62 char *user;
63 char *group;
64 char *exec;
65 char **argv;
66 int pid;
67 int status;
68 int flags;
69 program_list_t *next;
70 };
72 typedef struct program_list_and_notification_s
73 {
74 program_list_t *pl;
75 notification_t n;
76 } program_list_and_notification_t;
78 /*
79 * Private variables
80 */
81 static program_list_t *pl_head = NULL;
82 static pthread_mutex_t pl_lock = PTHREAD_MUTEX_INITIALIZER;
84 /*
85 * Functions
86 */
87 static void sigchld_handler (int __attribute__((unused)) signal) /* {{{ */
88 {
89 pid_t pid;
90 int status;
91 while ((pid = waitpid (-1, &status, WNOHANG)) > 0)
92 {
93 program_list_t *pl;
94 for (pl = pl_head; pl != NULL; pl = pl->next)
95 if (pl->pid == pid)
96 break;
97 if (pl != NULL)
98 pl->status = status;
99 } /* while (waitpid) */
100 } /* void sigchld_handler }}} */
102 static int exec_config_exec (oconfig_item_t *ci) /* {{{ */
103 {
104 program_list_t *pl;
105 char buffer[128];
106 int i;
108 if (ci->children_num != 0)
109 {
110 WARNING ("exec plugin: The config option `%s' may not be a block.",
111 ci->key);
112 return (-1);
113 }
114 if (ci->values_num < 2)
115 {
116 WARNING ("exec plugin: The config option `%s' needs at least two "
117 "arguments.", ci->key);
118 return (-1);
119 }
120 if ((ci->values[0].type != OCONFIG_TYPE_STRING)
121 || (ci->values[1].type != OCONFIG_TYPE_STRING))
122 {
123 WARNING ("exec plugin: The first two arguments to the `%s' option must "
124 "be string arguments.", ci->key);
125 return (-1);
126 }
128 pl = (program_list_t *) malloc (sizeof (program_list_t));
129 if (pl == NULL)
130 {
131 ERROR ("exec plugin: malloc failed.");
132 return (-1);
133 }
134 memset (pl, '\0', sizeof (program_list_t));
136 if (strcasecmp ("NotificationExec", ci->key) == 0)
137 pl->flags |= PL_NOTIF_ACTION;
138 else
139 pl->flags |= PL_NORMAL;
141 pl->user = strdup (ci->values[0].value.string);
142 if (pl->user == NULL)
143 {
144 ERROR ("exec plugin: strdup failed.");
145 sfree (pl);
146 return (-1);
147 }
149 pl->group = strchr (pl->user, ':');
150 if (pl->group != NULL)
151 {
152 *pl->group = '\0';
153 pl->group++;
154 }
156 pl->exec = strdup (ci->values[1].value.string);
157 if (pl->exec == NULL)
158 {
159 ERROR ("exec plugin: strdup failed.");
160 sfree (pl->user);
161 sfree (pl);
162 return (-1);
163 }
165 pl->argv = (char **) malloc (ci->values_num * sizeof (char *));
166 if (pl->argv == NULL)
167 {
168 ERROR ("exec plugin: malloc failed.");
169 sfree (pl->exec);
170 sfree (pl->user);
171 sfree (pl);
172 return (-1);
173 }
174 memset (pl->argv, '\0', ci->values_num * sizeof (char *));
176 {
177 char *tmp = strrchr (ci->values[1].value.string, '/');
178 if (tmp == NULL)
179 sstrncpy (buffer, ci->values[1].value.string, sizeof (buffer));
180 else
181 sstrncpy (buffer, tmp + 1, sizeof (buffer));
182 }
183 pl->argv[0] = strdup (buffer);
184 if (pl->argv[0] == NULL)
185 {
186 ERROR ("exec plugin: malloc failed.");
187 sfree (pl->argv);
188 sfree (pl->exec);
189 sfree (pl->user);
190 sfree (pl);
191 return (-1);
192 }
194 for (i = 1; i < (ci->values_num - 1); i++)
195 {
196 if (ci->values[i + 1].type == OCONFIG_TYPE_STRING)
197 {
198 pl->argv[i] = strdup (ci->values[i + 1].value.string);
199 }
200 else
201 {
202 if (ci->values[i + 1].type == OCONFIG_TYPE_NUMBER)
203 {
204 ssnprintf (buffer, sizeof (buffer), "%lf",
205 ci->values[i + 1].value.number);
206 }
207 else
208 {
209 if (ci->values[i + 1].value.boolean)
210 sstrncpy (buffer, "true", sizeof (buffer));
211 else
212 sstrncpy (buffer, "false", sizeof (buffer));
213 }
215 pl->argv[i] = strdup (buffer);
216 }
218 if (pl->argv[i] == NULL)
219 {
220 ERROR ("exec plugin: strdup failed.");
221 break;
222 }
223 } /* for (i) */
225 if (i < (ci->values_num - 1))
226 {
227 while ((--i) >= 0)
228 {
229 sfree (pl->argv[i]);
230 }
231 sfree (pl->argv);
232 sfree (pl->exec);
233 sfree (pl->user);
234 sfree (pl);
235 return (-1);
236 }
238 for (i = 0; pl->argv[i] != NULL; i++)
239 {
240 DEBUG ("exec plugin: argv[%i] = %s", i, pl->argv[i]);
241 }
243 pl->next = pl_head;
244 pl_head = pl;
246 return (0);
247 } /* int exec_config_exec }}} */
249 static int exec_config (oconfig_item_t *ci) /* {{{ */
250 {
251 int i;
253 for (i = 0; i < ci->children_num; i++)
254 {
255 oconfig_item_t *child = ci->children + i;
256 if ((strcasecmp ("Exec", child->key) == 0)
257 || (strcasecmp ("NotificationExec", child->key) == 0))
258 exec_config_exec (child);
259 else
260 {
261 WARNING ("exec plugin: Unknown config option `%s'.", child->key);
262 }
263 } /* for (i) */
265 return (0);
266 } /* int exec_config }}} */
268 static void set_environment (void) /* {{{ */
269 {
270 char buffer[1024];
272 ssnprintf (buffer, sizeof (buffer), "%i", interval_g);
273 setenv ("COLLECTD_INTERVAL", buffer, /* overwrite = */ 1);
275 ssnprintf (buffer, sizeof (buffer), "%s", hostname_g);
276 setenv ("COLLECTD_HOSTNAME", buffer, /* overwrite = */ 1);
277 } /* }}} void set_environment */
279 __attribute__((noreturn))
280 static void exec_child (program_list_t *pl) /* {{{ */
281 {
282 int status;
283 int uid;
284 int gid;
285 int egid;
287 struct passwd *sp_ptr;
288 struct passwd sp;
289 char nambuf[2048];
290 char errbuf[1024];
292 sp_ptr = NULL;
293 status = getpwnam_r (pl->user, &sp, nambuf, sizeof (nambuf), &sp_ptr);
294 if (status != 0)
295 {
296 ERROR ("exec plugin: Failed to get user information for user ``%s'': %s",
297 pl->user, sstrerror (errno, errbuf, sizeof (errbuf)));
298 exit (-1);
299 }
300 if (sp_ptr == NULL)
301 {
302 ERROR ("exec plugin: No such user: `%s'", pl->user);
303 exit (-1);
304 }
306 uid = sp.pw_uid;
307 gid = sp.pw_gid;
308 if (uid == 0)
309 {
310 ERROR ("exec plugin: Cowardly refusing to exec program as root.");
311 exit (-1);
312 }
314 /* The group configured in the configfile is set as effective group, because
315 * this way the forked process can (re-)gain the user's primary group. */
316 egid = -1;
317 if (NULL != pl->group)
318 {
319 if ('\0' != *pl->group) {
320 struct group *gr_ptr = NULL;
321 struct group gr;
323 status = getgrnam_r (pl->group, &gr, nambuf, sizeof (nambuf), &gr_ptr);
324 if (0 != status)
325 {
326 ERROR ("exec plugin: Failed to get group information "
327 "for group ``%s'': %s", pl->group,
328 sstrerror (errno, errbuf, sizeof (errbuf)));
329 exit (-1);
330 }
331 if (NULL == gr_ptr)
332 {
333 ERROR ("exec plugin: No such group: `%s'", pl->group);
334 exit (-1);
335 }
337 egid = gr.gr_gid;
338 }
339 else
340 {
341 egid = gid;
342 }
343 } /* if (pl->group == NULL) */
345 #if HAVE_SETGROUPS
346 if (getuid () == 0)
347 {
348 gid_t glist[2];
349 size_t glist_len;
351 glist[0] = gid;
352 glist_len = 1;
354 if ((gid != egid) && (egid != -1))
355 {
356 glist[1] = egid;
357 glist_len = 2;
358 }
360 setgroups (glist_len, glist);
361 }
362 #endif /* HAVE_SETGROUPS */
364 status = setgid (gid);
365 if (status != 0)
366 {
367 ERROR ("exec plugin: setgid (%i) failed: %s",
368 gid, sstrerror (errno, errbuf, sizeof (errbuf)));
369 exit (-1);
370 }
372 if (egid != -1)
373 {
374 status = setegid (egid);
375 if (status != 0)
376 {
377 ERROR ("exec plugin: setegid (%i) failed: %s",
378 egid, sstrerror (errno, errbuf, sizeof (errbuf)));
379 exit (-1);
380 }
381 }
383 status = setuid (uid);
384 if (status != 0)
385 {
386 ERROR ("exec plugin: setuid (%i) failed: %s",
387 uid, sstrerror (errno, errbuf, sizeof (errbuf)));
388 exit (-1);
389 }
391 status = execvp (pl->exec, pl->argv);
393 ERROR ("exec plugin: Failed to execute ``%s'': %s",
394 pl->exec, sstrerror (errno, errbuf, sizeof (errbuf)));
395 exit (-1);
396 } /* void exec_child }}} */
398 static void reset_signal_mask (void) /* {{{ */
399 {
400 sigset_t ss;
402 memset (&ss, 0, sizeof (ss));
403 sigemptyset (&ss);
404 sigprocmask (SIG_SETMASK, &ss, /* old mask = */ NULL);
405 } /* }}} void reset_signal_mask */
407 /*
408 * Creates three pipes (one for reading, one for writing and one for errors),
409 * forks a child, sets up the pipes so that fd_in is connected to STDIN of
410 * the child and fd_out is connected to STDOUT and fd_err is connected to STDERR
411 * of the child. Then is calls `exec_child'.
412 */
413 static int fork_child (program_list_t *pl, int *fd_in, int *fd_out, int *fd_err) /* {{{ */
414 {
415 int fd_pipe_in[2];
416 int fd_pipe_out[2];
417 int fd_pipe_err[2];
418 char errbuf[1024];
419 int status;
420 int pid;
422 if (pl->pid != 0)
423 return (-1);
425 status = pipe (fd_pipe_in);
426 if (status != 0)
427 {
428 ERROR ("exec plugin: pipe failed: %s",
429 sstrerror (errno, errbuf, sizeof (errbuf)));
430 return (-1);
431 }
433 status = pipe (fd_pipe_out);
434 if (status != 0)
435 {
436 ERROR ("exec plugin: pipe failed: %s",
437 sstrerror (errno, errbuf, sizeof (errbuf)));
438 return (-1);
439 }
441 status = pipe (fd_pipe_err);
442 if (status != 0)
443 {
444 ERROR ("exec plugin: pipe failed: %s",
445 sstrerror (errno, errbuf, sizeof (errbuf)));
446 return (-1);
447 }
449 pid = fork ();
450 if (pid < 0)
451 {
452 ERROR ("exec plugin: fork failed: %s",
453 sstrerror (errno, errbuf, sizeof (errbuf)));
454 return (-1);
455 }
456 else if (pid == 0)
457 {
458 int fd_num;
459 int fd;
461 /* Close all file descriptors but the pipe end we need. */
462 fd_num = getdtablesize ();
463 for (fd = 0; fd < fd_num; fd++)
464 {
465 if ((fd == fd_pipe_in[0])
466 || (fd == fd_pipe_out[1])
467 || (fd == fd_pipe_err[1]))
468 continue;
469 close (fd);
470 }
472 /* Connect the `in' pipe to STDIN */
473 if (fd_pipe_in[0] != STDIN_FILENO)
474 {
475 dup2 (fd_pipe_in[0], STDIN_FILENO);
476 close (fd_pipe_in[0]);
477 }
479 /* Now connect the `out' pipe to STDOUT */
480 if (fd_pipe_out[1] != STDOUT_FILENO)
481 {
482 dup2 (fd_pipe_out[1], STDOUT_FILENO);
483 close (fd_pipe_out[1]);
484 }
486 /* Now connect the `out' pipe to STDOUT */
487 if (fd_pipe_err[1] != STDERR_FILENO)
488 {
489 dup2 (fd_pipe_err[1], STDERR_FILENO);
490 close (fd_pipe_err[1]);
491 }
493 set_environment ();
495 /* Unblock all signals */
496 reset_signal_mask ();
498 exec_child (pl);
499 /* does not return */
500 }
502 close (fd_pipe_in[0]);
503 close (fd_pipe_out[1]);
504 close (fd_pipe_err[1]);
506 if (fd_in != NULL)
507 *fd_in = fd_pipe_in[1];
508 else
509 close (fd_pipe_in[1]);
511 if (fd_out != NULL)
512 *fd_out = fd_pipe_out[0];
513 else
514 close (fd_pipe_out[0]);
516 if (fd_err != NULL)
517 *fd_err = fd_pipe_err[0];
518 else
519 close (fd_pipe_err[0]);
521 return (pid);
522 } /* int fork_child }}} */
524 static int parse_line (char *buffer) /* {{{ */
525 {
526 if (strncasecmp ("PUTVAL", buffer, strlen ("PUTVAL")) == 0)
527 return (handle_putval (stdout, buffer));
528 else if (strncasecmp ("PUTNOTIF", buffer, strlen ("PUTNOTIF")) == 0)
529 return (handle_putnotif (stdout, buffer));
530 else
531 {
532 /* For backwards compatibility */
533 char tmp[1220];
534 /* Let's annoy the user a bit.. */
535 INFO ("exec plugin: Prepending `PUTVAL' to this line: %s", buffer);
536 ssnprintf (tmp, sizeof (tmp), "PUTVAL %s", buffer);
537 return (handle_putval (stdout, tmp));
538 }
539 } /* int parse_line }}} */
541 static void *exec_read_one (void *arg) /* {{{ */
542 {
543 program_list_t *pl = (program_list_t *) arg;
544 int fd, fd_err, highest_fd;
545 fd_set fdset, copy;
546 int status;
547 char buffer[1200]; /* if not completely read */
548 char buffer_err[1024];
549 char *pbuffer = buffer;
550 char *pbuffer_err = buffer_err;
552 status = fork_child (pl, NULL, &fd, &fd_err);
553 if (status < 0)
554 {
555 /* Reset the "running" flag */
556 pthread_mutex_lock (&pl_lock);
557 pl->flags &= ~PL_RUNNING;
558 pthread_mutex_unlock (&pl_lock);
559 pthread_exit ((void *) 1);
560 }
561 pl->pid = status;
563 assert (pl->pid != 0);
565 FD_ZERO( &fdset );
566 FD_SET(fd, &fdset);
567 FD_SET(fd_err, &fdset);
569 /* Determine the highest file descriptor */
570 highest_fd = (fd > fd_err) ? fd : fd_err;
572 /* We use a copy of fdset, as select modifies it */
573 copy = fdset;
575 while (select(highest_fd + 1, ©, NULL, NULL, NULL ) > 0)
576 {
577 int len;
579 if (FD_ISSET(fd, ©))
580 {
581 char *pnl;
583 len = read(fd, pbuffer, sizeof(buffer) - 1 - (pbuffer - buffer));
585 if (len < 0)
586 {
587 if (errno == EAGAIN || errno == EINTR) continue;
588 break;
589 }
590 else if (len == 0) break; /* We've reached EOF */
592 pbuffer[len] = '\0';
594 len += pbuffer - buffer;
595 pbuffer = buffer;
597 while ((pnl = strchr(pbuffer, '\n')))
598 {
599 *pnl = '\0';
600 if (*(pnl-1) == '\r' ) *(pnl-1) = '\0';
602 parse_line (pbuffer);
604 pbuffer = ++pnl;
605 }
606 /* not completely read ? */
607 if (pbuffer - buffer < len)
608 {
609 len -= pbuffer - buffer;
610 memmove(buffer, pbuffer, len);
611 pbuffer = buffer + len;
612 }
613 else
614 pbuffer = buffer;
615 }
616 else if (FD_ISSET(fd_err, ©))
617 {
618 char *pnl;
620 len = read(fd_err, pbuffer_err, sizeof(buffer_err) - 1 - (pbuffer_err - buffer_err));
622 if (len < 0)
623 {
624 if (errno == EAGAIN || errno == EINTR) continue;
625 break;
626 }
627 else if (len == 0)
628 {
629 /* We've reached EOF */
630 NOTICE ("exec plugin: Program `%s' has closed STDERR.",
631 pl->exec);
632 close (fd_err);
633 FD_CLR (fd_err, &fdset);
634 highest_fd = fd;
635 fd_err = -1;
636 continue;
637 }
639 pbuffer_err[len] = '\0';
641 len += pbuffer_err - buffer_err;
642 pbuffer_err = buffer_err;
644 while ((pnl = strchr(pbuffer_err, '\n')))
645 {
646 *pnl = '\0';
647 if (*(pnl-1) == '\r' ) *(pnl-1) = '\0';
649 ERROR ("exec plugin: exec_read_one: error = %s", pbuffer_err);
651 pbuffer_err = ++pnl;
652 }
653 /* not completely read ? */
654 if (pbuffer_err - buffer_err < len)
655 {
656 len -= pbuffer_err - buffer_err;
657 memmove(buffer_err, pbuffer_err, len);
658 pbuffer_err = buffer_err + len;
659 }
660 else
661 pbuffer_err = buffer_err;
662 }
663 /* reset copy */
664 copy = fdset;
665 }
667 DEBUG ("exec plugin: exec_read_one: Waiting for `%s' to exit.", pl->exec);
668 if (waitpid (pl->pid, &status, 0) > 0)
669 pl->status = status;
671 DEBUG ("exec plugin: Child %i exited with status %i.",
672 (int) pl->pid, pl->status);
674 pl->pid = 0;
676 pthread_mutex_lock (&pl_lock);
677 pl->flags &= ~PL_RUNNING;
678 pthread_mutex_unlock (&pl_lock);
680 close (fd);
681 if (fd_err >= 0)
682 close (fd_err);
684 pthread_exit ((void *) 0);
685 return (NULL);
686 } /* void *exec_read_one }}} */
688 static void *exec_notification_one (void *arg) /* {{{ */
689 {
690 program_list_t *pl = ((program_list_and_notification_t *) arg)->pl;
691 notification_t *n = &((program_list_and_notification_t *) arg)->n;
692 notification_meta_t *meta;
693 int fd;
694 FILE *fh;
695 int pid;
696 int status;
697 const char *severity;
699 pid = fork_child (pl, &fd, NULL, NULL);
700 if (pid < 0) {
701 sfree (arg);
702 pthread_exit ((void *) 1);
703 }
705 fh = fdopen (fd, "w");
706 if (fh == NULL)
707 {
708 char errbuf[1024];
709 ERROR ("exec plugin: fdopen (%i) failed: %s", fd,
710 sstrerror (errno, errbuf, sizeof (errbuf)));
711 kill (pl->pid, SIGTERM);
712 pl->pid = 0;
713 close (fd);
714 sfree (arg);
715 pthread_exit ((void *) 1);
716 }
718 severity = "FAILURE";
719 if (n->severity == NOTIF_WARNING)
720 severity = "WARNING";
721 else if (n->severity == NOTIF_OKAY)
722 severity = "OKAY";
724 fprintf (fh,
725 "Severity: %s\n"
726 "Time: %u\n",
727 severity, (unsigned int) n->time);
729 /* Print the optional fields */
730 if (strlen (n->host) > 0)
731 fprintf (fh, "Host: %s\n", n->host);
732 if (strlen (n->plugin) > 0)
733 fprintf (fh, "Plugin: %s\n", n->plugin);
734 if (strlen (n->plugin_instance) > 0)
735 fprintf (fh, "PluginInstance: %s\n", n->plugin_instance);
736 if (strlen (n->type) > 0)
737 fprintf (fh, "Type: %s\n", n->type);
738 if (strlen (n->type_instance) > 0)
739 fprintf (fh, "TypeInstance: %s\n", n->type_instance);
741 for (meta = n->meta; meta != NULL; meta = meta->next)
742 {
743 if (meta->type == NM_TYPE_STRING)
744 fprintf (fh, "%s: %s\n", meta->name, meta->nm_value.nm_string);
745 else if (meta->type == NM_TYPE_SIGNED_INT)
746 fprintf (fh, "%s: %"PRIi64"\n", meta->name, meta->nm_value.nm_signed_int);
747 else if (meta->type == NM_TYPE_UNSIGNED_INT)
748 fprintf (fh, "%s: %"PRIu64"\n", meta->name, meta->nm_value.nm_unsigned_int);
749 else if (meta->type == NM_TYPE_DOUBLE)
750 fprintf (fh, "%s: %e\n", meta->name, meta->nm_value.nm_double);
751 else if (meta->type == NM_TYPE_BOOLEAN)
752 fprintf (fh, "%s: %s\n", meta->name,
753 meta->nm_value.nm_boolean ? "true" : "false");
754 }
756 fprintf (fh, "\n%s\n", n->message);
758 fflush (fh);
759 fclose (fh);
761 waitpid (pid, &status, 0);
763 DEBUG ("exec plugin: Child %i exited with status %i.",
764 pid, status);
766 if (n->meta != NULL)
767 plugin_notification_meta_free (n->meta);
768 n->meta = NULL;
769 sfree (arg);
770 pthread_exit ((void *) 0);
771 return (NULL);
772 } /* void *exec_notification_one }}} */
774 static int exec_init (void) /* {{{ */
775 {
776 struct sigaction sa;
778 memset (&sa, '\0', sizeof (sa));
779 sa.sa_handler = sigchld_handler;
780 sigaction (SIGCHLD, &sa, NULL);
782 return (0);
783 } /* int exec_init }}} */
785 static int exec_read (void) /* {{{ */
786 {
787 program_list_t *pl;
789 for (pl = pl_head; pl != NULL; pl = pl->next)
790 {
791 pthread_t t;
792 pthread_attr_t attr;
794 /* Only execute `normal' style executables here. */
795 if ((pl->flags & PL_NORMAL) == 0)
796 continue;
798 pthread_mutex_lock (&pl_lock);
799 /* Skip if a child is already running. */
800 if ((pl->flags & PL_RUNNING) != 0)
801 {
802 pthread_mutex_unlock (&pl_lock);
803 continue;
804 }
805 pl->flags |= PL_RUNNING;
806 pthread_mutex_unlock (&pl_lock);
808 pthread_attr_init (&attr);
809 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
810 pthread_create (&t, &attr, exec_read_one, (void *) pl);
811 } /* for (pl) */
813 return (0);
814 } /* int exec_read }}} */
816 static int exec_notification (const notification_t *n, /* {{{ */
817 user_data_t __attribute__((unused)) *user_data)
818 {
819 program_list_t *pl;
820 program_list_and_notification_t *pln;
822 for (pl = pl_head; pl != NULL; pl = pl->next)
823 {
824 pthread_t t;
825 pthread_attr_t attr;
827 /* Only execute `notification' style executables here. */
828 if ((pl->flags & PL_NOTIF_ACTION) == 0)
829 continue;
831 /* Skip if a child is already running. */
832 if (pl->pid != 0)
833 continue;
835 pln = (program_list_and_notification_t *) malloc (sizeof
836 (program_list_and_notification_t));
837 if (pln == NULL)
838 {
839 ERROR ("exec plugin: malloc failed.");
840 continue;
841 }
843 pln->pl = pl;
844 memcpy (&pln->n, n, sizeof (notification_t));
846 /* Set the `meta' member to NULL, otherwise `plugin_notification_meta_copy'
847 * will run into an endless loop. */
848 pln->n.meta = NULL;
849 plugin_notification_meta_copy (&pln->n, n);
851 pthread_attr_init (&attr);
852 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
853 pthread_create (&t, &attr, exec_notification_one, (void *) pln);
854 } /* for (pl) */
856 return (0);
857 } /* }}} int exec_notification */
859 static int exec_shutdown (void) /* {{{ */
860 {
861 program_list_t *pl;
862 program_list_t *next;
864 pl = pl_head;
865 while (pl != NULL)
866 {
867 next = pl->next;
869 if (pl->pid > 0)
870 {
871 kill (pl->pid, SIGTERM);
872 INFO ("exec plugin: Sent SIGTERM to %hu", (unsigned short int) pl->pid);
873 }
875 sfree (pl->user);
876 sfree (pl);
878 pl = next;
879 } /* while (pl) */
880 pl_head = NULL;
882 return (0);
883 } /* int exec_shutdown }}} */
885 void module_register (void)
886 {
887 plugin_register_complex_config ("exec", exec_config);
888 plugin_register_init ("exec", exec_init);
889 plugin_register_read ("exec", exec_read);
890 plugin_register_notification ("exec", exec_notification,
891 /* user_data = */ NULL);
892 plugin_register_shutdown ("exec", exec_shutdown);
893 } /* void module_register */
895 /*
896 * vim:shiftwidth=2:softtabstop=2:tabstop=8:fdm=marker
897 */